Carrier Omnizone 09XC06, Installation, Start-Up And Service Instructions Manual

Page: 16 / 20

16
Fig. 10 — Motor Starter Setting
MAINTENANCE
Cleaning
The unit should be thoroughly cleaned inside and out. Frequency
of cleaning will depend on unit location and area conditions.
Drains must be kept free of dirt and trash. Coils can be cleaned
with a stiff brush, vacuum cleaner, or compressed air. Coil can be
reached through access panels.
Inspection
Check coil baffles for tight fit to prevent air from bypassing the
coil. Check panels for air leakage, particularly those sealing the
fan and coil compartments. Check for loose electrical connections,
proper refrigerant charge, and refrigerant piping leaks.
Air Filters
Air filters may be installed on the condenser air inlet. Air filters
should be replaced or cleaned on a regular basis depending on
how dirty the operating environment is. Failure to clean air filters
regularly will result in loss of unit performance and possible nui -
sance tripping of the high-pressure switch.
TROUBLESHOOTING
Refer to Table 13 to determine the possible cause of the problem
and the associated procedure necessary to correct it.
For the low ambient option on the 09XC06,08 units, see Fig. 11
and for the 09XC12-24 units see Fig. 12.
Table 12 — Condenser Motor Starter Settings
Table 13 — Troubleshooting Procedure
LEGEND
1.9
1.6
1.3
M
M-O
A-O
A
RESE
T-
O
CLASS 20
TEST
OVERLOAD SETPOINT WHEEL
MOTOR OVERLOAD RESET WHEEL
HP
208-230 V 460 V 575 V
FLA
FLA FLA
208V 230V
0.50
1.8 2.2 1.1 0.9
0.75 2.5 2.6 1.3 1.0
1.00
3.4 3.0 1.5 1.1
1.50 4.6 4.2 2.1 1.6
2.00
6.0 5.6 2.8 2.1
3.00 9.2 8.6 4.3 3.4
5.00
14.5 13.6 6.8 5.4
7.50 21.5 19.4 9.7 7.5
10.00
28.0 — 12.6 10.1
PROBLEM POSSIBLE CAUSE CORRECTION PROCEDURE
Unit will not Start
Loss of unit power Check power source.
Check fuses, circuit breakers, disconnect switch.
Check electrical contacts.
Unit voltage not correct Check and correct.
Open fuse Check for short circuit in unit.
Open protection device Check relays, contacts, pressure switches.
Unit or motor contactor out of order Test and replace if necessary.
Fan does not Operate Contactor or relay overload or out of order Test and replace if necessary.
Motor defective Test and replace if necessary.
Broken belt Replace belt.
Loose electrical contact Tighten contact.
Compressor is Noisy, but
will Start
Under voltage Check and correct.
Defect in compressor motor Replace compressor.
Missing phase Check and correct.
Compressor seized Check and replace if necessary.
Compressor Starts, but
does not Continue to Run
Compressor or contact defect Test and replace if necessary.
Unit is not properly charged Check and correct any leaks. Adjust refrigerant charge.
Unit is oversized Check heat load calculation.
Compressor is overloaded Check protection device and replace.
Check for missing phase.
Check TXV.
Check temperature in suction discharge line.
Unit is Noisy Compressor noise Check TXV and replace if necessary.
Check internal noise.
Tube vibration Check and correct.
Unit panel or part vibrating Check and tighten appropriate part.
TXV —
Thermostatic Expansion Valve